Peter told them to repent, and said that believers would baptize them.

Acts 2:37-40

37 When the people heard what Peter said, they felt very guilty [IDM]. So they asked him and the other apostles, “Fellow-countrymen, what should we (exc) do so that God will forgive us?”

38 Peter answered them, “Each of you should turn away from your sinful behavior. Then we(exc) will baptize you, if you now believe in Jesus Christ. Then God will give you the Holy Spirit. 39 God has promised to do that [MTY] for you and your descendants, and for all others who believe in him, even those who live far away from here. The Lord our God will give his Spirit to everyone whom he invites to become his people!” 40 Peter spoke much more and spoke strongly/forcefully to them. He pleaded with them, “Ask God to save you so that he will not punish you when he punishes these evil people who have rejected Jesus!”